PRS Occasion Selection for Multi-Frequency Positioning
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Solution Overview
Problem
In wireless communications, particularly for NB-IoT devices, measuring positioning reference signal (PRS) occasions across multiple frequencies is inefficient due to high power consumption and prolonged active duration, which impacts system throughput.
Innovation Solution
A method where a UE determines the order of PRS occasions to be measured across different frequencies based on time differences and tuning times, minimizing current consumption and active duration by optimizing the sequence of measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a UE measures PRS across multiple PRS occasions on different frequencies, then positioning measurement accuracy is improved, but power consumption increases and active duration is prolonged
Solution Approach 1:
The UE determines the optimal measurement order in advance by evaluating time differences between PRS occasions and receiver tuning times. This preliminary planning allows the UE to sequence measurements to minimize total active duration and power consumption while still achieving accurate positioning measurements across multiple frequencies.
2Measurement precision
If a UE measures PRS across multiple PRS occasions on different frequencies, then positioning measurement accuracy is improved, but active duration is prolonged
Solution Approach 1:
The UE performs preliminary calculation of time differences between PRS occasions and receiver tuning times to determine an optimal measurement sequence. This advance planning enables the UE to complete all necessary measurements across different frequencies in the minimum possible active duration.
Solution Approach 2:
The measurement order is dynamically determined based on the specific time differences between PRS occasions and the receiver's tuning characteristics. The UE adapts the measurement sequence to the actual timing conditions, optimizing active duration for each specific scenario rather than using a fixed measurement order.
3Measurement precision
If PRS measurements are performed across multiple frequencies, then positioning accuracy is improved, but system throughput is reduced
Solution Approach 1:
By determining the optimal measurement order in advance based on time differences and tuning times, the UE minimizes the total time required for multi-frequency PRS measurements. This reduces the time the receiver remains active, thereby minimizing impact on system throughput while still achieving accurate positioning.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may support selection of positioning reference signal (PRS) occasions. For example, a UE may identify a first pair of PRS occasions for monitoring a PRS at a first frequency and a second pair of PRS occasions for monitoring a PRS at a second frequency and occurring after the first pair of PRS occasions. The UE may measure a first PRS of the first pair of PRS occasions at the first frequency, and then measure a first PRS of the second pair of PRS occasions at the second frequency. The UE may then measure a second PRS of the first pair of PRS occasions at the first frequency after measuring the first PRS of the second pair of PRS occasions at the second frequency.